Meaning of NULL in English

NULL

■ adjective

1》 (usu. in phr. ~ and void ) having no legal force; invalid.

2》 having or associated with the value zero.

↘ Mathematics (of a set or matrix) having no elements, or only zeros as elements.

3》 having no positive substance.

■ noun

1》 a dummy letter in a cipher.

2》 Electronics a condition in which no signal is generated; something generating no signal.

■ verb Electronics cancel out, creating a ~.

Origin

ME: from Fr. nul , ~e , from L. ~us 'none', from ne 'not' + ullus 'any'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.